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In-Situ Automotive Gaseous Fuel System Leak Check Method

Publishing Venue

The IP.com Prior Art Database

Abstract

This invention addresses the need to assure that there are no undetected leaks in an automotive gaseous fuel system, which includes the compressed gas fuel tank 1 and the fuel line 2 from the fuel tank to a fuel cell stack or internal combustion engine 3. This method could be used as a system integrity diagnostic tool invoked by a repair technician or this method could be initiated as part of the shutdown procedure of a vehicle.

Country

United States

Language

English (United States)

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This is the abbreviated version, containing approximately
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In-Situ Automotive Gaseous Fuel System Leak Check
Method

This
invention addresses the need to assure that there are no undetected leaks in an
automotive gaseous fuel system, which includes the compressed gas fuel tank 1
and the fuel line 2 from the fuel tank to a fuel cell stack or internal
combustion engine 3. This method
could be used as a system integrity diagnostic tool invoked by a repair
technician or this method could be initiated as part of the shutdown procedure
of a vehicle.

Figure 1. Schematic
Diagram of the Leak Testing System

The
invention method is to simply (i) pressurize the fuel line 2 or tank 1,
(ii) isolate the fuel line 1 or tank 2, and (iii) measure the
pressure drop in the fuel line 1 or tank 2 over an arbitrary
period of time.

Referring to Figure 1, the method is summarized as
follows:

Close the solenoid
valves 4,5.

Log the pressure and
temperature readings from the temperature sensor 6 and pressure
sensor 7.

Measure the change in
pressure (DP) over an arbitrary period of time.

Calculate the DP due to temperature
changes only. If the measured DP from #3 does not
equal the calculated DP due to temperature changes only within some
arbitrary value, a significant leak must be present.

Because
most of the valves 4,5 and sensors 6,7 are already
in use on a vehicle, very little, if any, additional hardware will be required
for implementation. Although this
invention was originally intended for hydrogen fuel specifically, the technique
is equally a...